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Nb-Si-based alloys with low densityDensity and high melting pointMelting point exhibit excellent high-temperatureTemperature strength and creep resistance. The addition of titaniumTitanium improves fracture resistance as well as oxidation resistance. The thermodynamicThermodynamics equilibrium conditions for the electrochemical reduction of Nb2O5, TiO2TiO2, and SiO2SiO2 oxides were analyzed by performing thermodynamicThermodynamics calculations for the preparation of Nb-Si-Ti alloys by molten salt electrolysisMolten salt electrolysis in NaCl-CaCl2 molten saltsMolten salt, and the coupled reactions of the electrochemical reduction process were clarified. The results show that the order of oxide electrolytic reduction is Nb2O5, SiO2SiO2, and TiO2TiO2, in which the Nb2O5 and TiO2TiO2 are reduced to monomers one by one from high to low valence. In addition, during the reduction of Nb2O5, SiO2SiO2, and TiO2TiO2 under the influence of molten saltMolten salt and O2− undergo a phase transition to form CaSiO3 and CaTiO3, which are reduced sequentially by electrolysis. The final Nb-Si-Ti alloy can be obtained.

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Thermodynamic Analysis of Nb-Si-Ti Alloys Prepared by Molten Salt Electrolysis

  • 会议论文

  • 发表日期：

    2025年

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  • LingYue Song,
  • Hui Li,
  • Jinglong Liang

摘要

Nb-Si-based alloys with low densityDensity and high melting pointMelting point exhibit excellent high-temperatureTemperature strength and creep resistance. The addition of titaniumTitanium improves fracture resistance as well as oxidation resistance. The thermodynamicThermodynamics equilibrium conditions for the electrochemical reduction of Nb2O5, TiO2TiO2, and SiO2SiO2 oxides were analyzed by performing thermodynamicThermodynamics calculations for the preparation of Nb-Si-Ti alloys by molten salt electrolysisMolten salt electrolysis in NaCl-CaCl2 molten saltsMolten salt, and the coupled reactions of the electrochemical reduction process were clarified. The results show that the order of oxide electrolytic reduction is Nb2O5, SiO2SiO2, and TiO2TiO2, in which the Nb2O5 and TiO2TiO2 are reduced to monomers one by one from high to low valence. In addition, during the reduction of Nb2O5, SiO2SiO2, and TiO2TiO2 under the influence of molten saltMolten salt and O2− undergo a phase transition to form CaSiO3 and CaTiO3, which are reduced sequentially by electrolysis. The final Nb-Si-Ti alloy can be obtained.